Rotary valve



Jam. 4 9 192? L. E. LAWRENCE ROTARY VALVE 5 sh eets -Sheet 1 Filed June 29, 1925 15613 466 m 4 r L. E. LAWRENCE ROTARY VALVE F'led June 29, 1925 5 sheets -sheet 2 4 1927' LAWRENCE ROTARY VALVE 1925' 5 she ts-sheet Filed June 29,

m r H attozvw s I hm Jan; 4 .1927. 3

L. E. LAWRENCE ROTARY VALVE Filed June 29., 1925 5 Sheets -Shee'b 4 Jan. 4,192.7.

L. E. LAWRENCE ROTARY VALVE Fil d'June 29, 1925 5 sheets-Sht 5 MFL' nlicstion filed June nvention is ZUI improvement in rotzr 'intcrnnl combustion engines d the principal ohyect ot the This ry valves anti the like,

invent i is to provicle 2i novel casing scienterl to in the cylinder hezul or the engine,

and housing therein'o novel rotery valve and tiring chiimhen said valve governing the intelre snrl erfsust oi. snch engine, end einhorlying certain iovel features pertaining to cooli zincl ricotiou whereby o, more eilioient velve is ohteinetl.

@ther objects my inventionere to pro vitle e novel valve casing" halving short pets therein ing the englnehests up, or as the heart o't the c lintlers increeses due to heuvier lozrcls 1 9 to provide it novel metnorl of securing opposits directions ot rotation oi the Inner snol outer rotating valve members; to orovicle combination rotary valve and firing chsinber designed to give the compressed gases high turhulencei incl toprovide it novel luhricstion system utilizing the compression ofthe engine cylinder to torceoil through perforations in the outer rotating sleeve to the surt'ace oi the inner rotating distributing valve member.

Other minor objects or the invention. Will he hereinafter set forth.

1 will eltplein the invention With refer ence to the accompanying rlraivings which illustrate one practical eznhoilinient'thereof to enehle others to adopt oncl use the seme and; will summarize in the claims the essentials oi the invention, the novel features of construction, and novel combinations of ports. for all of which protection is clesired.

in i dl drawing l is e sirle elevation, partly in section, of on internal combustion engine, showing my novel coinhineil rotery vzilve encl'iiring chzunher applied thereto.

lees. rm. were Fig. is onencl elevetion thereof showing;

the mechanism for clrivinn; the inner snol outer rotating sleeves of the valve inv opposite directions but the some speecls.

igu 3 is o longitudinal.vertical section on the line S--th I infi l; is s top plan view. broken away, of the valve Fig. is s longituclinel verticel section on the line 5-5,

Fig. 6 is transverse vertical section on the line G--l r 1g. 4h i s e horisontel section on the line Z-J y l ig. is o. view ot theouter velve sleeve. lfig. l) is section on the line 9+9 8.. Fig. 10 is R View of the inner valve sleeve. l ig. ll e section on the line ill-ll ll).

Fig. 19, is e longituclinel vievvi, partly in section, showing in invention epplieol multiple unit engine.

l 13 is trans erse section on the line Fig. 142 view sl'lovving o means i sectioneliriing the inner vzilve sleeve,-

l ig. 1th is e vievr sl'iovving ineens sectionslizing the outer valve sleeve.

Fig. 16 is e section on the line 161l6 Flo. 15.

Sil

AS shown in theclrewings, my novel ro tery valve is porticulsrly sclepteclto he userl ,with an internal combustion engine A having rocohly driven from at crank shaft A in the usual manner. I

The upper encl of the cylinder A" is open and the casing 1 forms the head. of the cylins cylinder It in which a piston A? is reciprler z ll as shown in the drawings, saicl cosine;

being preferably rectangular in shspeyzrndl comprising; o1 hollow. costing closecl-fon its bottom, S lClES, and ends, but open at its top.

A cover plots 1 is 'reinovehly secured to the end of the cylinder toforin the cylinder heed hy moons ofholts 1 as shown, passing through suitable bores in casing l sncl cover 1 {UlCl-Bilfllllll the upper enrl ot the cylinrler A in the usual manner.

Mill

Within the cosine; l extending longitiitlinally therethrough is an integral tubular portion 1 adapted toreceive the rotary valve sleeves 7 and 8 (hereinafter referred to) ,s the ends of the casing l in way of the tubular portion 1 being cut away.

.Extending upwardly into the casing 1 Opposite the cylinder A isa firing chamber 1 opening at its bottom into the cylinder A, but closed at its, top, as at 1. Firing chamber 1 is substantially cylindrical in shape, the outlet thereof being restricted as' shown in Fig, 6 to give the gases a high turbulence or whirling motion while being compressed and whileexpanding on the firing stroke, causing eliicient burning. Extending down through the cover 1*,casing 1, and the I top 1 of the firing chamber 1. is a spark plug I 2 as shown in Flg; 6, said spark plug 2 bean intake port 1 extending through the side of the casing. 1 and communicating with the tubular ortion 1", and on theopposite side of the ring chamber 1" from the intake port 1*, is an exhaust port 1 likewise extending from the side of the casing 1 and communicating with the tubular portion 1 firin chamber 1 and ports 1 and 1 being all (lISPOSBClOIl the same side of the tubular portion I, with the firing chamber interposedbetween the ports 1*, 1 Intake port 1 registers with an intake manifold 3' supplying carbureted fuel vapors from a Ycaruretor (not shown) or other source of fuel supply. Exhaust port l registers with an exhaust manifold 4 connected with a mufller (not shown) in the usual manner or discharging into the atmosphere.

-ltotatably mounted within the tubular I portion 1 of the casing is. a sleeve 7 extending the full length of-said casing and having pairs of circumferential slots 7, 7, and 7, 7 "therein of suitable dimensions; The pair of intake slots 7 and 7 are located respectively one opposite the intake port 1, and the other opposite the half of the firing chamber port 1 adjacent the intake port 1. The pair of exhaust ports 7, 7", are-located respectively, one opposite the exhaust port 1 and the other opposite the half of the firing chamber port 1 adjacent the intake portl".

Preferably the adjacent edges of the intake slots 7'', 7 and of the exhaust slots 7, 7 are. internally beveled as at 7 'to allow for a free passage of the gases therethrough.

Bothends of SIEG'IVGQT are open, but one end 7 is adapted to extend through thee'nd of easing 1, and is provided on its outer end with a perforatedcannularflange 7% to which is secured a gear wheel 7. A suitable washer 5 is preferably interposed between the casing l and the gear 7 sleeve 7. I j

lVithin the slotted sleeve 7 is an inner rotatable sleeve Swhich'is preferably hollow around the and slightly longer thansleeve 7. In the walls of sleeve 8 are tworecesses .8, 8", theintake recess 8 extending from a point opposite the outer edge of slot 7 11,1 sleeve 7 to a point opposite the outer edge of slot' 7 whereby when slots 7, 7", and recess 8 register a passage from intake port l to'the hrmgchamber 1" will be established. The

exhaust recess-8 of sleeve 8 similarly embraces the slots 7, 7 of sleeve 7. Preterably I' provide two separate ports T" 7?, in the outer sleeve? adapted to register puth the firing chamber port 1, instead of a sur gle port as has been heretofore done, for the following reasons. Assuming the case of a single 'unit engine having one common port in the outer sleeve reglstering with the firing chamber port, the exhaust and intake pockets in the inner sleeve would. necessarily be connected, making one long pocket. As

soon as the common port was opened for the exhaust stroke, the flame would ignite such fresh charge as would-be left in the pocket from the previous intake stroke, ere-- ating a back pressure at the beginning of the exhaust stroke, and thereby lowering the power output.- Also the fresh charge in the pocket would bewasted because the ex-.

haust portwould beopen, and the burning charge would be discharged without doing any work. Then, on the intake stroke, immediately following the exhaust stroke, the piston would draw into the cylinder the dead or spent gas in the pocket before any fresh charge couldenter the firing chamber, the

dead gas occupying space which should be, filled with a fresh charge, causing slow ignition and low pressure on the piston, and a consequent loss of power. Moreover, timing would not occur at the. cylinder port, as it should, but would occur at the extreme ends of the pocket. In the case of a multi-unit' engine using one common port in the outer v sleeve to register with the single firing chamber ports, the'same condstion would hold as above described in connection with the single unit enginev except that proper t ming of such engine would be impossib e to attain, because each intake port would teed two adjacent cylinders and the center exhaust port would exhaust two adjacent cylinders. To accomplish this the outer sleeve is cutaway enough to allow two successive intakes, and thus timing at the end of the pockets farthestfrom the cylinder is impossible, and hence timing at the cylinder port is impossible,and the engine could not properly junction. Were the engine turned over by L. mm tints tws sapclmmbet' chamber wntmllstt mm is wen l lgnltisn 1e pocket. l lst lmssuclmcl bath. stl'nke lint lyelo as peels is? tlmss as, {3nd ssh clmzrt s. illi? mm tlevsl tnomy lit for them lml'lleil the llEQ-litlst slimlm, not Wlll 'tlls st by (lead; @xlmus' ffns cylinder on the nts 'es can be obtaimcl parts-in the wt 1; with tlxe firing mm wntmlllng 'tlxs intmlzs, 12 srtlmust.

vlnl ntef 'c register with tlxs '1' 1'15; in my design all enl the cyllntller part 1 we nuns 0t t zmt ()t'lOl" lssigl'ls show shown in l0 amtl ill 8 llvslm'nhlil concms lCllHE'tl sectlolz-through t l arc-1m l the m2 s fiction mm the mid point st 'tlll b 18 t0 e1 m l l latest changing" progress s1 vol from 9. 0

ssctor t0 a 110 are 0t The peculiar slzzlps thus given the mtt, ll pm viclss a tree unobstructed paslusugh the sleeves wlmn the intake must of sleeve ilwscs sss in l3 tlw 8% l register with tlls teasml of the tact are ammlt-s 1n lo'nc shape at the 'ms passsgretmss ssctmn lluS nstlung' tails Wltll'l the 'i zlpinl winning and slim fit tlls valve, mnlllL pm'lml aver which mlw'rsmztlns known as (lWsll.

ssing tlegjenrls solvly tlm mt? mem m's the [l a 211; th s ppm! pm'lozl tlspsmls solely m'lgle smlatenilstl by n mlnsr zls comp-a :wsen the UPEDF J its in slthst' lly using tws slglclly n in-wpll nslte (lil'mtisms. 'li lzs 1am essstltial to the success alas;

s pmvkletl its sncl "an m m t0 WlllCll 1s sscmscl it chain sprocliet the slut 8 0t sleet-rs P bet'vssn tlm clmin splrmlist 8 and ms adju' cent sml l 0t sleeve"? is stunting masher $01 suitsljle dimensions mt m2 m (i into the ,ml of sleeve 8 s!) as t0 l'ntm'is w aslmli 10 is pmferably 'Wesm tliw 91ml sllgsve Sec LliBlJE f 1 9 is s memlasl" into 1 lCll t; e s lSlOlllG pl'ujscts mlcl 2t sttith be); msnslm: having slams Eli forming): an EX tsnsisn stems msmlper l0, fits wound mull on lt 'ztml angel the itzsmlzer Suitable patching may lg mtsrposscl be tween startling box -l, Jet's. ll 211ml 11 msmlssl" 1W may rotate Whsrelvy mmhsr Lil i, member 10 tlxs stalling bow: Ill may lm son-- "his. menta Wrl l1 a: source t sleeve 8 usts 13 39110. 13

- l. llf'k m tbs Basing 1511 a, lfQtCliEll p s'mbshatt l t sxtsndlng therefrom parallel t0 the sleeves '1, and; 8. Shaft M9 carries a 1-4 01 ssms size anl meshing: with the gssr 71 011 sleeve vhet'sb y' sleeve 3" and shat 1 are caused t0 rotatq, in 0p posits cllt'ections and at the same speeds. Slmlft 14W slss carries a sprocket l t and dis posed. op-pnsits the SPIVOCliBl; 8 of sleeve 8,

Gear and spzsclist- 14 and 1412MB fastened. getllsrybutsm not lgeyecl t0 the stationmfysttlls M. Roth fl i" sml i l are przsssstl on busl'llng which E'ClRtt/QS freely upon stul) shaft, A roller chain l5 HHlS mist" spl'ockets 8 21m ll and undo? it sprtlcll'st A: at same sins spmcltets 8" nmmntetl an counter slmtt it lintstlng; halt "the the 'ns crank shaft.

tlil Valve casing is stfectstl by po 'liiml 9 (fussing:

spmclmts M and filming mt same size.

FLlJOV'G wlflstlffl jt slesws 'l and Smash 110" tats halt the emnlt sllztt'tspsstl, 1n-

' in the top of the Water cooling ducts of the cylinder A,*-whereby the cooling water will circulate from the cylinder block Within 'the same.

the casing 1 and around the intake and exhaust ports, '1", 1 the firing chamber 1 and the tubular sleeve Cooling water is also passed axially through the inner sleeve8, the water entering the member 11 through a pipe 16 con nected to a source of Water supply, such as awater main or the radiator (not shown) of an automobile. T he cooling water passes through the extension member 10, the inner sleeve 8, from the exhaust endtot'he intake end of the sleeve 8, and out through extension 12 and member 13 from whence it passes through a pipe 17 into the cooling ducts A of the engine cylinder A, the

water passing from thence up through slots 1 into the valve casing 1. and out through a pipe 18 to the radiator other cooling receptacle. his system of circulation wherein the water is passed first through the inner sleeve 8 and then through V keeping the valves 7 and 8 cool throughout,

warping is eliminated or maintained to a negligible degree, and water cooling of the casing places the only valve surface exposed to the heat of combustion between two water cooled surfaces, thus facilitating rapid heat dissipation.

The outer sleeve 7 is designed to completely close the firing chamber 1 during the latter part of the compression'stroke and the first part of the firing stroke, also the inner sleeve 8 is in a similar position thus making a double seal between high and low pressure along the circumference of the valve. p 1 Y A ground fitbetween. the outer sleeve 7 and the tubular casing 1 holds the lubricating oil film to a thickness of about .001 inch for the entire valve length. Compression is heldl lengthwiseof the valve by a section of this oil film equalto the width of the port, and of length equal to the distance between the portand the manifolds, giving good results and negligible valve leakage. Lubricating ,oil is supplied to lubricate outer sleeve 7 from the tubularcasing 1 preferably from an' oil cup, or h fsleeves t and 8 effects opposite directions of rotation-thereof, giving quick open ng and pump (not shownlthrough a pipe 19 enter ing a bore 1 communicating with the tubulaiportion 1 opposite the firing; chamber housing 1?, to cool not shown) or- 1 An oil groove 1 extends longitudinally of the-portion 1 passing the inner .endof pipe 19, and distributes the oil longitudi nally of the sleeve 7.

Lubrication: of the inner-sleeve 8 is ac complished by utilizing'th'e compression in the firing chalnb'erfl to force lubricating oil through perforations in the outer sleeve 7 to the inner sleeve 8. A series of holes or perforations '7 extend diametrically through the outer sleeve 7 opposite the exhaust slot 7 therein, and' in such position that they appear in the firing chamber port 1' at the beginning-of the compression stroke and disappear therefrom just/before firing occurs. Holes 7 are made small enough so as to each be covered by a thin' compression pressure the films of oil are driven through perforations 7 in the outer sleeve 7 and deposited on the surface of the inner sleeve 8; each succeeding revolution depositing a film of 011 under high pressure,

causesthe spreading of oil lengthwise of the valve, and thus the entire inner sleeve 8 is automatically lubricated. An oil groove 7 is preferably provided extending longitudinally within the sleeve 7 to aid in spreading the oil ov erithe entire surface of the inner sleeve 8.

and I do not limit my invention to the exact form shown in the drawings.

My invention provides a valve casing having short gas passages in the valve casing beginning and ending on the same slde of the inner rotating-sleeve '8, said sleeve revolving inside an outer revolving sleeve 7 having ports therein, the two said sleeves rotating in opposite directions, within the stationary casing. The cooling water is first passed through the inner rotating sleeve 8 from the exhaust end to the intake end, then through the motor block A wand casing 1 so as to maintain propericlearance between the inner rotating sleeve 8 and the outer rotating sleeve 7, and between the outer rotating sleeve 7 and the. stationary casing 1.

"Instead of using only oneside of the cas ing 1 for the intake and exhaust ports 1, 1, both sides of the casing may be used whereby double use of the pair of gas passageways in the inner and in the outer sleeves may be had, the slots and recesses in the sleeves 7 and 8 registering twice for each revolution.

My novel means for rotating the valve closing of the ports. Instead of using a reta l-eesingle chain, two chains may be used, one chain driving one sleeve at one end of the casing, and the other chain driving the other sleeve from the opposite end.

Multiple ports may be used in my valve so as to allow the sleeves to be rotated at. different fractions of the crankshaft speed,

depending upon the number of ports in the rotating sleeves.

My rotary valve and combined firing chamber are designed to give the compressed gases high turbulence, and the compression of the engine is used to force lubricating oil shown in Fig. 1 1, would reduce the bending" v moment thereof permitting same to fit itself into the outer sleeve 7 without undue strains, and the small flexures which would acc0mpany warping would fall within the elastic limit of the material of the sleeve and eliminate breakage. In Fig. lathe sleeve 8 compr.ses a pluralityof aligned sections, the ends thereof being closed, as at 8 and having internal annular flanges 8. extending axially .of the ends 8 Exterior to flanges 8 are series of pins 8 which make a press lit in the end 8 of one section, the pins 8 maktionsare caused to rotate in unison. EX- tending through the adjacent annular flanges 8 is a sleeve 8 making a tight-fit therein and connecting the adjacent ends of the sections together, while permitting the cooling water to pass therethrough as previously described.

1 The outer sleeve 7, as shown in Figs; 15 and 16 may be sectionalizcd at any point or points throughout its length, the adjacent ends of the sections being provided with interlocking driving. dogs 7 for rotating the sections in unison. The dogs 7 may be disposed opposite a slot 7, 7 7 or 7 or may be located in a solid section, hence the total valve length may be broken up into as many parts as desired. My novel valve maybe used to supply a Q plurality of cylinders operating from a common crankshaft with fuel, and to remove the burnt gases by using an extended form of the valve along the cylinders parallel to the crankshaft, also one valve may control the intake and exhaust of two rows of cylinders ing a sliding fit in perforations in the end, 8 of the adjacent section whereby the secw operating from two crankshafts' geared to gether by placing the valve between the two rows.

in Figs. 12 and 13 my novel, rotary valve is illustrated in connection with a multiple unit engine, four cylinders A being shown, in which pistons A reciprocate, said pistons being operated from a crankshaft A in theusual manner. The valve casing 100 forms the'heads of the cylinders and is removably bolted thereto as shown in Fig;

Extending through the casing 100 is a tubular portion 101 adapted to house the valve sleeves hereinafter referred to. Opposite each cylinder A, in the lower face of the casing 100 is a firing chamber 102 communicating with the tubular portion 101, and spark plugs 103 extend into chamber-102.

llnlet ports 104i extend from the side of cas ing 100 and communicate with the tubular portion 101,. said ports 104.. being preferably disposed intermediate adj'acent'cylinders-so that one port will feed two cylinders with fuel vapors supplied by the manifold 105 from a suit-able carburetor (not shown),

making possible a shorter engine than if each cylinder were provided with a separate. intake port 104. The same arrangement I may be used for the exhaust ports 100, except, the exhaust ports 106 for the end cylinders which can take care of but one cylinder each. An exhaust manifold 10? connects the three exhaust ports 106, with a' suitable muffler (not shown) or discharges into the atmosphere. Within the tubular portion 101 is a sleeve 108 extending the full length thereof said sleeve being provided with longitudinal slots 109 therein opposite each of the intake ports 104i, exhaust ports 106, and firing chamber ports 102, the slots is provided with: suitably sized and located intake recesses 111 and exhaust recesscsllil,

.nur

the recesses being similar in shape to the recesses 8 and 8* of Fl 3, 10 and 11. The

sleeves 108 and 11.0 areadapted to rotate in opposite directions at half engine crank shaft speed to establish communication between the intake ports and the firing chambers, and between the exhaust ports and-the firing chambers of the several units on proper sequence, in a manner similar to the valve operation of the engine shown in Figs. 1 toll inclusive. A stub-shaft 113 is driven at half engine speed by means of a chain 11 1 running over suitablyv sized sprockets 1'15 and 116 on. the crank sliaft-A -and stub-shaft 113 respectively.

A chain 11;? runs over sprockets and 119 of samesize, on the stub'shaft 113 and on an. extension of the outer sleeve 108 respectively,.and intermeshing gearsi120,.12l

of same size on the stubshaft 113' and the 105 109 being of suitable size and suitably 10- The hollow inner sleeve 110 is roinner sleeve I10 drives the inner sleeve 110 at the same speed as the outer sleeve 108 but in the opposite direction. Suitable stufiing boxes 122 and 123 aroundextensions of the inner sleeve 110 permit cooling water to cir culate through the inner sleeve 110, the methodof cooling the valve being thesame est-hat described in connection with the engine shown in Figs. 1 to 11 inclusive.

I do not limit my invention to the exact form shown in the drawings for obviously changes may be made therein Within the scope of'the claims.

I claim: a

1. In an internal combustion engine, a rotary valve comprising a tubular casing having a port communicating with the en gine cylinder, and having anintake port and an exhaust port; a rotary sleeve in said tubular portion, having intake slots adapted to register with the intake port and with the cylinder port respectively, and having exhaust slots adapted to register with the exhaust port and with the cylinder port respectively; an inner sleeve rotatably mounted in said outer sleeve, and having r V cesses therein adapted to embrace the intake slots and the exhaust slots respectively; said recesses beingarcuate in longitudinal cross section, and progressively changing from a sector of a circle to an arc of a circle in transverse cross-section from the mid points to each end of the recsses.

2. In an internal combustion engine, a rotary. valve comp-rising a tubular casing having a'port communicating with the engine cylinder, and having an intake port and an exhaustport; a rotary sleeve in said tubular portion having a pair ofintake slots adapted to register with the intake port and with the cylinder port respectively, and having a pair of exhaust slots therein adapted to register with the exhaust port and with the cylinder port respectively; and an inner sleeve rotatably mounted within said outer sleeve, and having recesses therein adapted to embrace the intake slots and the exhaust slots respectively; said recesses being arcuate in longitudinal cross section, and progressively changing from a sector of a circle to an arc of a circle in transverse cross section from the mid point of the recesses to each end.

3. In an internal combustio eng'ne, a rotary valve comprising a tubular casing having a port communicating with the en-' .gine cylinder, and having an intake port and circle to an arc of a circle in transverse v cross-section from the mid points of the remunicatin mentioned sleeve, and having recesses therein adapted to embrace theintake slots and the exhaust slotsrespectively; said recesses being arcuate in longitudinal cross section, and progressively changing from a sector ofa cesses to each end; and means for rotating f the sleeves in opposite directions.

4. In an internal combustion engine, a valve casing; a tubular portion Within the casing; a firing chamber in said casing communicating with the tubular portion; an intake port for the tubular portion; an exhaust port for the tubular-portion; a rotary sleeve in said tubular portion having a pair of aligned intake slots therein disposed opposite the intake port and firing chamber respec tively; and having a pair of aligned exhaust slots therein disposed opposite the exhaust port and firing chamber port respectively; and a second sleeve rotatable Within the first sleeve, and having longitudinally disposed recesses therein adapted to embrace the pairs of intake slots and the pairs of exhaust slots respectively as the sleeves are rotated.

5; In an internal combustion engine, a valve casing; a tubular portion extending longitudinally within the casing; a firing chamber in said casing having a port comwith the tubular rtion; an intake port or the tubular portion; an exhaust port for the tubular portion; a rotary sleeve in said tubular portion having a pair.of circumferentiallyv disposed aligned intake slots therein disposed opposite the intake port and firing chamber port respectively and having a pair of circumfgerentially disposed aligned exhaust slots therein disposed opposite the exhaust port and firing chamber port respectively; a second sleeve rotatable within the first sleeve, and having longitudinally disposed recesses therein adapted to embrace the pairs of intake slots and the pairs-of exhaust slots respectively as the sleeves are rotated; and means for rotating the sleeves.

6. In an internal combustion engine, a valve casing;'a tubular portion extendinglongitudinally within the casing; a firing chamber in said casing and having a port communicating with the tubular portion adjacent its mid point; an intake port communicating with the tubular portion adjacent one end of the casing; an exhaust port communicating with the tubular portion adjacent the opposite end of the casing; said intake and exhaust ports being disposed on the same side of the tubular portion as the firing chamber; a rotary sleeve in said tubular portion having apair of circumferentially disposed aligned intake slots therein disposed opposite the intake port and tiring chamber port respectively, and having a pair of circumferentially disposed aligned exhaust slots therein disposed opposite the exhaust port llh relates and firing chamber port respectively; a second sleeve rotatable Within the first sleeve and having longitudinally disposed recesses therein adapted to embrace the pairs of intake slots and the pairs of exhaust slots respectively as the sleeves are rotated; and means for rotating the sleeves in opposite directions.

7. In an internal combustion engine atubular'valve -asing having a port communicating With theengine cylinder; and a pair of rotary sleeve valves in said tubular portion rotating one within the other, the outer sleeve having a series of perforations therein adapted to'registe'r with the firing chamber port during the compression stroke; whereby on the compression stroke lilms'of oil vvill be forced through said perforations-to lubricate the inner sleeve from the outer sleeve.

8. In an internal combustion engine, a casing adapted to form the engine cylinder head; a tubular portion Within the-casing having a port. communicating with the engine cylinder; a pair of rotary sleeves in said tubular portion rotating one within the other, the outer sleeve having a series t per "forations therein adapted to register with the firing chamber port during the compression stroke; and means 'fOIfdQPOSIl/Hig a film .of oil around the outer sleeve, whereby on the compression stroke films of oil'will be forced throughsa'id perforations to lubricate the inner sleeve from the outer sleeve! 9. In an internal combustion engine a valvecasing adapted to form the en ine cylinder head; a tubular portion 'exten ing longitudinally within the casing; and having a port communicating with the engine cylinder ;'a pair of rotary sleeves in said tubular portion rotating-one Within the other,

the outer sleeve having .a series of perfora' tions therein adapted to register with the firing chamber port during the comprezsion stroke; and means for feeding lubricating oil between the outer sleeve andthe tubularportion to deposit a film of oil aroundthe till outer sleeve, whereby on the compression stroke films of oil will be forced through said series of perforations to lubricate the inner sleeve from thejouter sleeve.

10. In an internal combustion engine a valve casing adapted to form the engine cylinder head; 'a tubular portion extending longitudinally Within" the casing; a firing chamber in said casing and having a. portcommunicating with the tubular portion; said tubular portion having longitudinally disposed oil grooves in its inner Walls 'a pair of rotary sleeves in said tubular portion r0- tating one within the other; the outer sleeve having a series of perforations therein adapted to register with thefiring chamber port during the compression stroke, and having oil grooves longitudinally disposed therein; and means for feeding lubricating oil clyinder between the outer sleeve and the tubular portion to deposit a film of oil around the outer sleeve, whereby during the compression stroke films of oil will be forced through said perforations to lubricate the inner sleeve from the outer sleeve.

11. In an internal combustion engine, a'

cylinder head easing having alongitudinal bore, and having a firing chamber having a' port 'cbmmunicating with the bore; said Elli bore having an intake port, and an exhaust v posite the intake port and firing chamber respettively, and having a pair of aligned exhaust slots therein disposed opposite the exhaust port and firing chamber respectively; and the inner sleeve having longitudinally disposed recesses in its surface adapted to embrace'the respective pairs of slots in the outer sleeve as the sleeves rotate.

12. In air intcrnal'combustion engine, a cylinder head casing having a longitudinal bore andhaving a firing chamber having a port connnunicating with the bore and said bore having an intake port and an exhaust port; said' intake port and exhaust portbeing in longitudinal alignment with the firing chamber port a rotary sleeve in said bore having a pair of aligned intake slots therein disposed op'posite'the intake port and firing chamber respectively, and having a pair of aligned exhaust slots therein disposed opposite the exhaust port and firing chamber respectively; a second sleeve rotatable Within the first sleeve and having longitudinally disposed recesses in its surface embracing each pa1r of slots; andineans for rotating the sleeves in opposite directions. 13. In an internal combustion engine, a

cylinder head casing having a longitudinalbore and having a firing'chamber having a port communicating With the bore and cylinder; said bore having an intake port and an exhaust port; said intake port and exhaust port and firing chamber port being disposed on the same side of the bore and being in longitudinal alignment; a rotary sleevein said bore having a pair of aligned intake slots therein disposed opposite the intake port and firing chamber respectively,

and having a pair of aligned exhaustslots therein disposed oppositathe exhaust port and firing chamber respectively; a sec ond sleeve rotatable within the first sleeve and having longitudinally disposed recesses in its surface adapted to embrace the'pair of intake slots and the pair of exhaust slots respectively as the sleeves are rotated; and

means for rotating the sleeves in opposite directions.

14. In an internal combustion engine, a cylinder head casing having a longitudinal bore and havinga firing chamber disposed to one side of the bore communicating with the cylinder, the chamber having aportcommunicating with the bore ad acent its mid point; said bore having an intake port adjacent one end of the casing and having an exhaust port adjacent the opposite end of the casing; said intake port and exhaust port and firing chamber port being disposed on the same side of the bore and in longitudinal alignment; a rotary sleeve in said bore having a pair of aligned intalie slots therein opposite the intake port and firing chamber port respectively, and having a pair of aligned exhaust slots therein vopposite the exhaust port and firing'ohamber port respectively; a second sleeve'rotatable' within the first sleeve and-shaving longitudinally disposed recesses in its surface adapted to embrace the pair of intake slots and the pair of exhaust slots respectively as the sleeves arerotated; and means for rotating the sleeves in opposite directions.

, 15. For an internal combustion engine, a

valve casing having a firing chamber, an

intake port, and exhaust port;'a rotatable sleeve extending through the casing and having a pair of-intake slots disposed opposite the intake port and firing chamber respectively, and having a pair of exhaust slots opposite the exhaust port and firing chamber respectively; and a member rotatable within the sleeve and provided with recesses adapted'to embrace the respective pairs of slots.

16. In combination with a valve casing as set forth in claim 15; meansfor depositing a film of oil around the first mentioned sleeve; said sleeve having a series' ofper- 'foratio'ns therein opposite'the firing chamber port whereby films of oil will be forcedthrough the perforations to lubricate the inner rotatable member from said sleeve.

'17. For multi le unit internal combustion engine, a va ve casing having a plurality of firing chambers, one for each unit;

said valve casing having -'a plurality of intake ports and exhaust ports, said intake ports being disposed intermediate adjacent cylinders and adapted to feed two adjacent cylinders; a rotatable sleeve extending through the casing and having pairs of intake slots disposed opposite the intake ports and firing chambers respectively, and having pairs of 'exhaust slots opposite the exhaust ports and firing chambers respectively; and a: member-rotatable within the sleeve and provided with recesses adapted to embrace the respective pairs ofslots.

- 18. In combination with a valve casing as set forth in claim 17, meansv for deposit- 

